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This web application provides access to a collection of critically evaluated thermodynamic property data for pure compounds with a primary focus on organics. These data were generated through dynamic data analysis, as implemented in the NIST ThermoData Engine software package. As of November, 2011, WTT - Professional Edition contains information on 23399 compounds and access to a total of 512538 evaluated experimental data points. This product also provides critically evaluated data for some non-molecular species such as radicals and organic salts carried from the TRC Thermodynamic Tables published from 1942-2009.

Various search options based on compound information (empirical formula, partial name, molecular weight) are provided. Data presentation features an interactive JavaScript-based Web interface with dynamic window-in-window navigation. Dynamic table generation based upon user input and interactive data plotting capabilities are also provided. Unlimited data retrieval and their local storage and use are permitted. For details regarding analytical methods and interacting with the interface, see the site user's guide.

Evaluated properties that appear in the WTT are (note that all listed properties are not necessarily available for all included compounds):

Complimentary WTT-Pro data availability information (properties provided for a given compound, ranges of validity, number of experimental data points) can be accessed by those without a subscription at http://wtt-pro.nist.gov.